Mosin Tech

The other day I was trying to figure out why I still have a hard bolt cycle on a 42 izzy mosin of mine. I have done everything of IV8888 video, even hand polished the bolt, and the thing still cycles like crap. I took it apart again and I mixed up the firing pin spring from my m39 by accident and it cycled super smooth. So my question is if this is the issue, do any of you guys have any experience with RSI firing pin spring replacement and if they are m39 quality? I have the bolts and the scopes mounts and pretty much all their stuff just not that. Let me know what you guys think.

I do, I developed them.. They are made to a better spec and if I do say so myself make a huge improvement in the bolt. They improve the lock and cycling right out of the package but once they "set" the bolt will cycle even better. I worked for many months getting the right balance of poundage to performance.

I've put them in all my riflesSeeyaMark

“Americans have the right and advantage of being armed – unlike the citizens of other countries whose governments are afraid to trust the people with arms.” (James Madison, The Federalist Papers #46 at 243-244)

I can attest to the RSI spring being a outstanding piece . I have them in two of my bolts . Smooth and the right amount of pressure to lock it down , when closed . Lots of "Good on ya", Mark . For the time and effort to develop this spring . I just sent another bolt to Ken for my new build , and it will also have their spring put in it .

Thanks Grindl: It took many hours of work to get that where it is. I have some prototypes I'm working on now for another spring. That would be for reloaded ammo primers only. It may be available sometime next year.

I also developed a new K31 firing pin spring for RSI as well as their Mosin Trigger Shoe.

SeeyaMark

“Americans have the right and advantage of being armed – unlike the citizens of other countries whose governments are afraid to trust the people with arms.” (James Madison, The Federalist Papers #46 at 243-244)

Now you have my attention . Why a different spring for reloaded ammo primers ? I've shot 80-90% reloads at 1,000 yds. for most of the last year or so and haven't seen any issues that would require a different spring .

I use both Winchester standard LR primers , and BR-2 primers in these loads , and haven't had any problems . I inspect my fired cases / primers for depth of penetration , watching carefully for any signs of over-penetration , or primer case puncturing . Am I missing something ?

Have the trigger shoes on both my Timney's , also . Even pressure and clean feel to the "Break" . Nice .

Well because reload primers are not as hard as surplus I had to make a few compromises with poundage. If your shooting reloads you can make the spring differently (trying not to tip my hand here to much) It's truly a balancing act. I had many failures along the way that's for sure.

The shoe idea came from an article I read many years ago where long range completion guys were using trigger shoes to make their stock triggers feel lighter. I thought I would revisit it with a modern approach. I really liked how it almost forced my finger into the proper location and it made the Timney feel even better on the break.

Well more Mosin goodies to develop.SeeyaMark

“Americans have the right and advantage of being armed – unlike the citizens of other countries whose governments are afraid to trust the people with arms.” (James Madison, The Federalist Papers #46 at 243-244)

Marauder 1 wrote:Well because reload primers are not as hard as surplus I had to make a few compromises with poundage. If your shooting reloads you can make the spring differently (trying not to tip my hand here to much) It's truly a balancing act. I had many failures along the way that's for sure.

The shoe idea came from an article I read many years ago where long range completion guys were using trigger shoes to make their stock triggers feel lighter. I thought I would revisit it with a modern approach. I really liked how it almost forced my finger into the proper location and it made the Timney feel even better on the break.

Well more Mosin goodies to develop.SeeyaMark

I like the shoe idea. My Mosin trigger is great but it is kinda sharp on the edges. A shoe should make it even more comfortable.